package com.shengsiyuan.netty.secondexample;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

/**
 * 客户端的初始化
 *
 * @author 荀彧 2021/1/5
 */
public class MyClientInitializer extends ChannelInitializer<SocketChannel> {

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {

        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
        // 编码器
        pipeline.addLast(new LengthFieldPrepender(4));
        // 设置字符串解码器
        pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
        // 设置字符串编码器
        pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));
        // 我们自己的处理器
        pipeline.addLast(new MyClientHandler());
    }
}

